For me nothing beats the Dual Bulk Reef Supply GFO & Carbon Reactor....Its reasonably priced, easy to assemble and get going with no leaking..Replacement parts are eay to get if needed, the only difference is that I run carbon and Purigen by Sea Chem in mine. Purigen is reasonably priced, easy to recharge, last and removes phosphates for crystal clear water, cant beat it and with this reactor you dont have to worry about its small size getting out of reactor..... See link below!!!

http://www.bulkreefsupply.com/store/...n-reactor.html